I knew it once you said OAM and died 2003 as the RM Williams store located at Airds of Lockinvar and is not far from where I live...in 2003 just before he passed, I had an American mate of mine that asked me to buy him a genuine Australian hat, he wanted a slouch hat, he is a USMC Vietnam vet and remembers the Aussie larackins from Nam with greqt respect and affection. As he said to me on many occasions I would rather fight beside Australian troops then any others becaue you guys have no fear, you look after your mates and you dont take shit from anyone.
I ended up getting him an Akubra stockmens hat. To this day he says its the best hat he's ever owned.